kitio.aiOpenAI Codex vs Butterfish
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Butterfish is completely free, while OpenAI Codex is freemium.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Cloud coding tasks
- Codex CLI
- IDE extension
- Desktop app
- Automatic PR review
- AI prompts inside bash and zsh
- Shell history as context
- Command autocomplete from AI
- Goal mode agent
- Neovim plugin
| Feature | OpenAI Codex | Butterfish |
|---|---|---|
| Best for | OpenAI's coding agent in the cloud, CLI, IDE and desktop app | Open-source shell wrapper that adds AI prompts to bash and zsh |
| Category | Coding | Coding |
| Pricing model | Freemium | Free |
| Starting price | $8/mo | Free |
| Free plan | Yes | Yes, fully free |
| Made by | OpenAI | Peter Bakkum |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Butterfish is completely free, while OpenAI Codex is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
6 plans
Free
Free
- Limited Codex usage
- Via ChatGPT account
Go
$8/mo
- ChatGPT Go plan
- More Codex usage than Free
Plus
$20/mo
- ChatGPT Plus plan
- Codex in CLI, IDE and cloud
Pro
$100/mo
- Starting price; $200 and $500 tiers
- Highest Codex limits
Business
$25/mo
- Per user
- Shared workspace and admin controls
Enterprise
Contact sales
- Enterprise security
- Flexible usage
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
OpenAI Codex
- Included in ChatGPT plans
- Runs many tasks in parallel
- Open-source CLI
- Token-based limits are hard to predict
- Free tier usage is small
Butterfish
- Free and MIT licensed
- No copy and paste between tools
- Keeps your existing shell setup
- Needs your own OpenAI-compatible API key
- No Windows support
- Agent mode can run commands on your system
Which one should you choose?
Choose OpenAI Codex if you want:
- Included in ChatGPT plans
- Runs many tasks in parallel
- Open-source CLI
Watch out: token-based limits are hard to predict.
Choose Butterfish if you want:
- Free and MIT licensed
- No copy and paste between tools
- Keeps your existing shell setup
Watch out: needs your own openai-compatible api key.
OpenAI Codex vs Butterfish FAQ
What is the difference between OpenAI Codex and Butterfish?
OpenAI Codex: OpenAI's coding agent in the cloud, CLI, IDE and desktop app. Butterfish: Open-source shell wrapper that adds AI prompts to bash and zsh. Both are coding tools.
Is OpenAI Codex or Butterfish cheaper?
Butterfish is completely free, while OpenAI Codex is freemium.
Do OpenAI Codex and Butterfish have free plans?
OpenAI Codex: Yes. Butterfish: Yes, fully free.
Who makes OpenAI Codex?
OpenAI Codex is made by OpenAI, based in United States.
Who makes Butterfish?
Butterfish is made by Peter Bakkum.
Which should I choose, OpenAI Codex or Butterfish?
Choose OpenAI Codex if you value included in chatgpt plans and runs many tasks in parallel. Choose Butterfish if you value free and mit licensed and no copy and paste between tools.